/*
 * Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.security.access;

import java.io.Serializable;

import org.springframework.security.access.intercept.RunAsManager;

/**
 *  用户请求一个资源所需要的角色会被封装成一个ConfigAttribute对象
 *
 * @author Ben Alex
 * @author sam
 */
public interface ConfigAttribute extends Serializable {
	// ~ Methods
	// ========================================================================================================

	/**
	 * 1.该方法返回一个String字符串，就是角色的名称
	 * 2.一般来说，角色名称都带有一个ROLE_前缀
	 *
	 * @return a representation of the configuration attribute (or <code>null</code> if
	 * the configuration attribute cannot be expressed as a <code>String</code> with
	 * sufficient precision).
	 */
	String getAttribute();
}
